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sick sinus syndrome in Medicine

sick sinus syndrome

n.
  1. Chaotic atrial activity characterized by an abnormally slow heartbeat punctuated by recurring ectopic beats and periods of an abnormally rapid heartbeat.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.